feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.

src/Framework/Queue/Exceptions/AllStepsCompletedException.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\Core\QueueErrorCode;
+use App\Framework\Exception\ExceptionContext;
+
+/**
+ * Exception thrown when attempting to complete or update steps after all steps are completed
+ */
+final class AllStepsCompletedException extends QueueException
+{
+    public static function forJob(string $jobId, int $totalSteps): self
+    {
+        $context = ExceptionContext::forOperation('step.complete', 'StepProgressTracker')
+            ->withData([
+                'job_id' => $jobId,
+                'total_steps' => $totalSteps,
+                'current_step_index' => $totalSteps,
+            ]);
+
+        return self::create(
+            QueueErrorCode::INVALID_STATE,
+            "All {$totalSteps} steps have already been completed for job '{$jobId}'",
+            $context
+        );
+    }
+}

src/Framework/Queue/Exceptions/ChainNotFoundException.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\Core\QueueErrorCode;
+use App\Framework\Exception\ExceptionContext;
+
+/**
+ * Exception thrown when a job chain cannot be found
+ */
+final class ChainNotFoundException extends QueueException
+{
+    public static function byId(string $chainId): self
+    {
+        $context = ExceptionContext::forOperation('chain.lookup', 'JobChainManager')
+            ->withData([
+                'chain_id' => $chainId,
+                'search_type' => 'by_id',
+            ]);
+
+        return self::create(
+            QueueErrorCode::CHAIN_NOT_FOUND,
+            "Chain with ID '{$chainId}' not found",
+            $context
+        );
+    }
+
+    public static function byName(string $name): self
+    {
+        $context = ExceptionContext::forOperation('chain.lookup', 'JobChainManager')
+            ->withData([
+                'chain_name' => $name,
+                'search_type' => 'by_name',
+            ]);
+
+        return self::create(
+            QueueErrorCode::CHAIN_NOT_FOUND,
+            "Chain with name '{$name}' not found",
+            $context
+        );
+    }
+}
+

src/Framework/Queue/Exceptions/CircularDependencyException.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\Core\QueueErrorCode;
+use App\Framework\Exception\ExceptionContext;
+
+/**
+ * Exception thrown when circular dependencies are detected in job chains
+ */
+final class CircularDependencyException extends QueueException
+{
+    public static function inChain(string $chainId, array $circularDependencies = []): self
+    {
+        $context = ExceptionContext::forOperation('chain.validate', 'JobChainExecutionCoordinator')
+            ->withData([
+                'chain_id' => $chainId,
+                'circular_dependencies' => $circularDependencies,
+            ]);
+
+        return self::create(
+            QueueErrorCode::CIRCULAR_DEPENDENCY,
+            "Chain '{$chainId}' has circular dependencies",
+            $context
+        );
+    }
+}

src/Framework/Queue/Exceptions/InvalidChainStateException.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\Core\QueueErrorCode;
+use App\Framework\Exception\ExceptionContext;
+
+/**
+ * Exception thrown when a job chain is in an invalid state for the requested operation
+ */
+final class InvalidChainStateException extends QueueException
+{
+    public static function notPending(string $chainId, string $currentStatus): self
+    {
+        $context = ExceptionContext::forOperation('chain.start', 'JobChainManager')
+            ->withData([
+                'chain_id' => $chainId,
+                'current_status' => $currentStatus,
+                'required_status' => 'pending',
+            ]);
+
+        return self::create(
+            QueueErrorCode::INVALID_STATE,
+            "Chain '{$chainId}' is not in pending status (current: {$currentStatus})",
+            $context
+        );
+    }
+
+    public static function alreadyCompleted(string $chainId): self
+    {
+        $context = ExceptionContext::forOperation('chain.modify', 'JobChainManager')
+            ->withData([
+                'chain_id' => $chainId,
+                'current_status' => 'completed',
+            ]);
+
+        return self::create(
+            QueueErrorCode::INVALID_STATE,
+            "Chain '{$chainId}' is already completed and cannot be modified",
+            $context
+        );
+    }
+
+    public static function alreadyFailed(string $chainId): self
+    {
+        $context = ExceptionContext::forOperation('chain.modify', 'JobChainManager')
+            ->withData([
+                'chain_id' => $chainId,
+                'current_status' => 'failed',
+            ]);
+
+        return self::create(
+            QueueErrorCode::INVALID_STATE,
+            "Chain '{$chainId}' has failed and cannot be modified",
+            $context
+        );
+    }
+}
+

src/Framework/Queue/Exceptions/InvalidDeadLetterQueueNameException.php

@@ -5,42 +5,42 @@ declare(strict_types=1);
 namespace App\Framework\Queue\Exceptions;
 
 use App\Framework\Exception\FrameworkException;
-use App\Framework\Exception\ErrorCode;
+use App\Framework\Exception\ValidationErrorCode;
 
 final class InvalidDeadLetterQueueNameException extends FrameworkException
 {
     public static function tooShort(string $name, int $minLength): self
     {
         return self::create(
-            ErrorCode::VAL_BUSINESS_RULE_VIOLATION,
+            ValidationErrorCode::BUSINESS_RULE_VIOLATION,
             "Dead letter queue name '{$name}' is too short. Minimum length is {$minLength} characters."
         )->withData([
             'name' => $name,
             'actual_length' => strlen($name),
-            'min_length' => $minLength
+            'min_length' => $minLength,
         ]);
     }
 
     public static function tooLong(string $name, int $maxLength): self
     {
         return self::create(
-            ErrorCode::VAL_BUSINESS_RULE_VIOLATION,
+            ValidationErrorCode::BUSINESS_RULE_VIOLATION,
             "Dead letter queue name '{$name}' is too long. Maximum length is {$maxLength} characters."
         )->withData([
             'name' => $name,
             'actual_length' => strlen($name),
-            'max_length' => $maxLength
+            'max_length' => $maxLength,
         ]);
     }
 
     public static function invalidFormat(string $name, string $pattern): self
     {
         return self::create(
-            ErrorCode::VAL_BUSINESS_RULE_VIOLATION,
+            ValidationErrorCode::BUSINESS_RULE_VIOLATION,
             "Dead letter queue name '{$name}' contains invalid characters. Only alphanumeric characters, underscores, hyphens, and dots are allowed."
         )->withData([
             'name' => $name,
-            'valid_pattern' => $pattern
+            'valid_pattern' => $pattern,
         ]);
     }
-}
+}

src/Framework/Queue/Exceptions/JobNotFoundException.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\Core\QueueErrorCode;
+use App\Framework\Exception\ExceptionContext;
+use App\Framework\Queue\ValueObjects\JobId;
+
+/**
+ * Exception thrown when a job cannot be found
+ */
+final class JobNotFoundException extends QueueException
+{
+    public static function byId(JobId $jobId): self
+    {
+        $context = ExceptionContext::forOperation('job.lookup', 'JobPersistenceLayer')
+            ->withData([
+                'job_id' => $jobId->toString(),
+                'search_type' => 'by_id',
+            ]);
+
+        return self::create(
+            QueueErrorCode::JOB_NOT_FOUND,
+            "Job with ID '{$jobId->toString()}' not found",
+            $context
+        );
+    }
+
+    public static function inQueue(JobId $jobId, string $queueName): self
+    {
+        $context = ExceptionContext::forOperation('job.lookup', 'Queue')
+            ->withData([
+                'job_id' => $jobId->toString(),
+                'queue_name' => $queueName,
+                'search_type' => 'in_queue',
+            ]);
+
+        return self::create(
+            QueueErrorCode::JOB_NOT_FOUND,
+            "Job '{$jobId->toString()}' not found in queue '{$queueName}'",
+            $context
+        );
+    }
+}
+

src/Framework/Queue/Exceptions/QueueException.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\FrameworkException;
+
+/**
+ * Base exception for Queue module
+ *
+ * All Queue-related exceptions should extend this class.
+ */
+class QueueException extends FrameworkException
+{
+}
+

src/Framework/Queue/Exceptions/RedisExtensionNotLoadedException.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Queue\Exceptions;
+
+use App\Framework\Exception\Core\QueueErrorCode;
+use App\Framework\Exception\ExceptionContext;
+
+/**
+ * Exception thrown when Redis PHP extension is not loaded
+ *
+ * This is typically caught and handled with graceful fallback to FileQueue.
+ */
+final class RedisExtensionNotLoadedException extends QueueException
+{
+    public static function notLoaded(): self
+    {
+        $context = ExceptionContext::forOperation('queue.init', 'QueueInitializer')
+            ->withData([
+                'required_extension' => 'redis',
+                'loaded_extensions' => get_loaded_extensions(),
+                'fallback_available' => 'FileQueue',
+            ]);
+
+        return self::fromContext(
+            'Redis PHP extension is not loaded',
+            $context,
+            QueueErrorCode::WORKER_UNAVAILABLE
+        );
+    }
+}